QR Code API Blueprint
A developer-oriented reference for modeling QR assets, dynamic routes, branding, lifecycle, analytics, idempotency, webhooks, permissions, and batch operations.
Separate the code from the service around it
A QR image, redirect path, final destination, design preset, campaign, and event have different lifecycles.
Code
The encoded payload plus rendering metadata, format, dimensions, margin, and error correction.
Route
A durable public path with destination, status, ownership, version, and change history.
Design
An approved visual template with validated color, frame, logo, label, and output constraints.
Campaign
A grouping for placement taxonomy, ownership, dates, policy, and reporting dimensions.
Event
A redirect request, state change, job completion, threshold alert, or audit record.
Operation
An asynchronous batch, export, archive, or rendering job with explicit status and result.
Create a route, then render the code
The example host is intentionally generic. It demonstrates resource separation rather than a live PopQR endpoint.
POST https://api.example.com/v1/routes
Idempotency-Key: spring-campaign-store-017
Authorization: Bearer <scoped-token>
{
"path": "spring-017",
"destination": "https://brand.example/spring?store=017",
"campaign_id": "cmp_spring_2026"
}
POST https://api.example.com/v1/codes
{
"payload": "https://go.brand.example/spring-017",
"design_id": "design_pop_frame",
"format": "svg",
"size": 1200
}Make retries and failures predictable
Production integrations need behavior that remains safe under timeouts, duplicates, partial batches, and delayed notifications.
Idempotent writes
Return the original result when a client safely retries the same creation or mutation request.
Structured errors
Provide stable error codes, field paths, request IDs, and explicit retry guidance without leaking secrets.
Async operations
Represent large batches and exports as jobs with status, progress, results, and expiration.
Signed webhooks
Use event IDs, timestamps, replay support, raw-body signatures, and bounded retry behavior.
Scope every credential
The permission to render a static image should not automatically include control of public redirects or access to granular analytics.
| Scope | Allows | Should not allow |
|---|---|---|
| codes:write | Render approved static QR assets. | Change public routes or read another tenant’s resources. |
| routes:write | Create and update managed destinations within policy. | Issue credentials, change DNS, or bypass approval controls. |
| analytics:read | Read permitted aggregate campaign reports. | Export raw identifiers unless separately authorized. |
| webhooks:admin | Manage delivery endpoints and signing secrets. | Change routes or campaign content. |
Ship a contract teams can trust
Document lifecycle and edge cases as carefully as the happy path.
OpenAPI contract
Version operations, fields, examples, authentication, error responses, and deprecation behavior.
Tenant isolation
Make ownership explicit and test resource, export, webhook, and analytics boundaries.
Destination policy
Validate schemes, block dangerous inputs, monitor abuse, and preserve administrative review.
Scan QA
Test generated assets on representative cameras and hardware, not only with an image decoder.
Audit history
Record who changed a public route, what changed, and which version was active at a given time.
Migration
Export durable identifiers and preserve public branded paths as implementations evolve.
Implementation questions
No. The examples are implementation patterns for teams building or evaluating a QR API. They are not advertised as live hosted endpoints.
At minimum, distinguish the encoded code asset, managed public route, final destination, visual design, campaign labels, and scan or lifecycle events.
Clients retry network requests. An idempotency key prevents a timeout and retry from creating duplicate public routes, assets, or billable work.
SVG is useful for scalable production artwork, while PNG is convenient for digital use. APIs should validate dimensions, margin, contrast, and supported design settings.